Testing machine



F. A. VALENTINE ET AL July 24, 1928,

TESTING MACHINE Filed Oct. 22, 1926 2 Sheets-Sheet 1 a Mww m? n 32W N/.d W x i m July 24, 1928. 1,678,369

V Y F. A. 'VALENTINE ET AL TESTING MACHINE Filed Oct. 22, 1926 2 Sheets-Sheet 2 ITIIIIlIflIii"ml|illllllllllllllllllllilllll IN V EN TOR-3.

Patented July 24, 1928.

UNITEDeSTATES 1,678,369 F FFIC FRANK A. VALENTINE, OF AIPPONAUG, AND DAVID C. sco'rrr; or r'novinnncn; 'RH oDE ISLAND, ASSIGNORS TO HENRY; n. scorrcom rnnY, OF lBOYIDENCE, :arronn r ISLAND,.A CORPORATION or RHODE ISLAND. V

TESTING MACHINE.

1 Application filed October 22, 1926." s riai ub. 1433720 This invention relates to improvements in testing machines employed for obtaining the strength or stretch of materials; and has for its object to provide mechanism of this character which is positive in its tensilon-applying movement and which movement will be automatically ,arrested upon reaching theend ofits tensioning stroke and means being provided for quickly returning the pullingmechanism to'i'ts startin'g'posi- 'tion' after each testing operation.

A further object of the invention vis the provision of a rackand'a power 'driven pinion engaging the rack to apply tens ion strokes thereto, means being provided for arresting the. power-applying mechanism at theend of its tension stroke and a gravity actuated means 'such as a 'welght or other v suitable means being also provided for quickly returning the rack toits starting point after eachtensionstroke.

.A still further object of the invention is the provision of a second rack operated by to its starting position.

With these and otherobjects in view, the invention c'onsists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claims. a

"In the accompanying drawings: 7 I Figure 1- is "a-planview showingthe' gear casing ipartly in section and illustrating our improved mechanism. Figure 2 is a front elevationshowing the casing J partly ,in section illustrating our improved mechanism. V v Figure 3 is a side elevation partly in section showing a portion of the driving mech ,anism shaft. Figure 4 is a side elevation showing the in the box.

Figure 5' is a groupjof mechanism illustrating the stop on the rack as engaging the shift mechanism to control the withdrawing action of the drive gagement with its gear,

two racks in connection: with the gearing" strengthor the stretch or both, of different a Weightfor quickly returning the first rack as operatively mounted on a cross worm from en-- Figural; is a perspectiveview showing 1naterials,{of advantage to provide simple and effective mechanism whereby 1 the pull may be positively and continuously applied to the Work being tested and Whenthe testing stroke or travel has been finishedytc automatically tripthe pulling mechanism which Will return promptly and automatically to its starting' position ready to repeat the operation; and the following is a-I detailed description of the present en'lbodiment of our invention and showing one arrange- 'men't by which these .advantageoiis results may be accomplished': p p 1 1 With reference to the drawings, lO designates the gearcasing in which ourimproved mechanism ishoused,"powerbeing' applied to the mechanism through a pulley 11 preferablyf-rom an electric motor (not shown). From this pulley the power is transmitted U through shaft 12 to the worm 13 insid'e the" casing. This worm is'hrrangcd to mesh with the Wormjgeai' 14 which is mounted on a sleeve 15 to theinher endoi' which is con nected a spur gear 16 and through which -motion imparted to the corresponding gear 17 on the'shaft18, which shaftisiotatably mounted in aforked rocker bracket 19, which I bracketf swings on the fixed shaft 20, the

bracket being provided with an upwardly extending arm 21 having a roll 22" to engage acarn, presently rilescribed. *In the space'23 35 of this rocker bracket and'on the shaft 18 mounted in the bearings 'in'this bracket is [mounted a-Worm QA-tofbe swung by the bracket into and out of engagement with a wormgea'r 25, which latteugear is fixed'on the shaft 26 and on this'shaftlis alsoiixed the spur gear 27. Meshing with'this gear- 27 is the pull rack 28 which is sliclably guided in the upper and lower walls of the casing 10 the upper end of this rack being connected with the'usual clamp 29for gripping the lower endofthe work 46 and on this rack is adjustably mounted thetripper dog 30 which is slid along the rack and secured in adjustedposition by means of'a screw Also meshing with this rack'28 below gear 27;i's' a slightlyv l argergear 32" mounted on a-Sshortshaft 33 and-a second vertically slidable rack 34L meshes with this gear 32 and is arranged to eXtendthrongh the casing both above and below the same. On the'lcwerendof this rack 34' is hung a Weight 35which serves to return t Pull rack to its starting position after the driving mechanism has been disconnected. A pawl 36 is mounted on the short shaft 37 and is provided with an operating arm 38, the lower end of which extends through the shaft to engage a stop pin 39 to limit the back throw of the pawl when withdrawn from the teeth of the rack 34.

In order to automatically disconnect the driving mechanism from the pull mechanism, we have provided a vertically-disposed push rod 40 which extends down into the box. On the upper end of this rod is a presser arm 41 extending out to be engaged by the dog 30 on the rack 28 when the latter has reached the end of its pulling stroke. On this push rod within the casing, we have mounted a cam 42, the working face of which is engaged by a roll 22 on the rocker bracket arm 21, the lower end of this push rod being slidably mounted in bearing 40 and is slotted as at 43 to receive the guide pin 44 whereby the rod is prevented from rotating to hold its camand its arm 41 in proper operating alignment. The lower part of the casing is partitioned off to provide an oil well 45 containing a lubricant in which the gears dip to distribute lubrication to the operating mechanism.

On this push rod 40, we have also mounted ya finger lever 46 by which the same may be lifted manually after having been pressed down by the dog on the pull rack, which upward movement of this rod serves to cause the arm 21 to move outward onv thecam42 and swing the worm 24 back into engagement with the driving worm gear 25 tostart another pulling action of the rack on the work 46. In other words, when it is desired to start the pull rack 28 to exert a tension on the work, it is only necessary to lift the push rod 40 through the finger lever 46, the gears will then be in mesh to operate and draw downwardly the pull rack 28 until the dog 30 contacts with the arm 41 on the push rod 40, when the bracket arm 21 under action ofits spring 47 swingsinward and serves to withdraw the worm 24'from the worm gear 25 which action releases the power from the rest of the mechanism and permits the weight 35 to act through its rack 34 (which is lifted as rack 30 drops) and gear 32, upon this opposite rack 30 to return this pull rack quickly to its starting position.

If for any reason it is desired that this quick return should not be required the pawl 36 is tipped forward into engagement with the teeth of rack 34 which will prevent a return movement of the pull rack until the pawl has again been withdrawn to permit the return action of the weight 35 and racks 30 and 34.

This improved driving mechanism for testing machines is very simple and practical in its construction, is effective in its operation and by its use work may be quickly and accurately tested and after the test the mechanism automatically returns to its starting point ready to repeat the operation.

The foregoing description is directed solely towards the construction illustrated, but we desire it to be understood that we reserve theprivilege of resorting to all the mechanical changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claims. p Y e claim: I r I 1. In a testingmachine, a pull member through which tension is applied to the work being tested, driving mechanism. for actuating said pull member in one direction, means for releasing said pull member from the act-ion of said driving mechanism, and gravity actuated means for quickly return: ing said pull member toits starting position when so released. I p q 2. In a testing Amachine, a pull .rack

through which tension is applied to the work being tested, a power driven gear engaging said rack, means operable at the end of the driving stroke for rendering ineffective the driving action of said gear on said rack, and gravity actuated means for quickly returning said rack to itsstarting position.

In a testing machine, a pull rack through which tension is applied to the work being tested, a gearthrough which said rack is driven, means operated at the,

end of each tension stroke for rendering ineffective the driving action of said gear, and a gravity actuated second mu; arranged to act upon said power rackto return it to nor- 4. In a testing .machine, a pull rack through w-hich tension is applied to the work being tested, a. gear through which said rack is driven, means operated at the end of eachtension stroke for renderi ng ineffectivethe driving action of said gear, a second gear engaging said rack, a second rackengaging said second gear, and means acting upon said second rack to return the first rack to its starting point. a

5. In a testing machine, a pull rack through which tension is applied to the work being tested, 'a gear through which said rack is driven, means operated at the end of each'tension stroke for rendering ineffective the driving action of said gear, a second rack gear, and a gravity actuated rack varranged to actupon said second gear to return said pull rack. I

(3. In a testing machine, a pull rack through which; tension is applied to the work being tested, a power driven gear engaging said rac k, means operable at the end of the driving stroke for rendering ineffective the driving action of said gear on said rack, and adjustable means for preventing said return action when desired.

7. In a testing machine, a pull rack through which tension is applied to the work being tested, a gear through Which said rack is driven, means operated at the end of each tension stroke for rendering ineffective the driving action of said gear, a

second. gear engaging said rack, a second her for preventing the return action of said mechanism when desired.

In testimony whereof We aflix our signatures.

FRANK A. VALENTINE. DAVID C. SCOTT. 

